Identify before connecting
Use vehicle labels, unique fittings, service information, and approved identification procedures.
R-12 is ozone-depleting
CFC-12 was used in older MVACs and has significant ozone-depletion and climate effects.
R-134a and R-1234yf are not interchangeable
They use different equipment and fittings; mixing can contaminate cylinders, equipment, and vehicles.
R-744 has a narrow venting exception
Carbon dioxide is exempt from the Section 608 venting prohibition, but Section 609 certification and equipment requirements still apply to paid MVAC service.
Common mistakes
- Charging by cylinder color alone
- Treating substitutes as drop-in replacements
- Using universal adapters
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